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Proceedings Paper

Development of a fast steering secondary mirror prototype for the Giant Magellan Telescope
Author(s): Myung K. Cho; Andrew Corredor; Christoph Dribusch; Kwijong Park; Young-Soo Kim; Il-Kweon Moon; Won Hyun Park
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Paper Abstract

The Giant Magellan Telescope (GMT) will be a 25m class telescope currently in the design and development phase. The GMT will be a Gregorian telescope and equipped with a fast-steering secondary mirror (FSM). This secondary mirror is 3.2 m in diameter and built as seven 1.1 m diameter circular segments conjugated 1:1 to the seven 8.4m segments of the primary. The prototype of FSM (FSMP) development effort is led by the Korea Astronomy and Space Science Institute (KASI) with several collaborators in Korea, and the National Optical Astronomy Observatory (NOAO) in USA. The FSM has a tip-tilt feature to compensate image motions from the telescope structure jitters and the wind buffeting. For its dynamic performance, each of the FSM segments is designed in a lightweight mirror. Support system of the lightweight mirror consists of three axial actuators, one lateral support at the center, and a vacuum system. A parametric design study to optimize the FSM mirror configuration was performed. In this trade study, the optical image qualities and structure functions for the axial and lateral gravity print-through cases, thermal gradient effects, and dynamic performances will be discussed.

Paper Details

Date Published: 17 September 2012
PDF: 14 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 844420 (17 September 2012); doi: 10.1117/12.926643
Show Author Affiliations
Myung K. Cho, National Optical Astronomy Observatory (United States)
Andrew Corredor, The Univ. of Arizona (United States)
Christoph Dribusch, The Univ. of Arizona (United States)
Kwijong Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Young-Soo Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Il-Kweon Moon, Korea Research Institute of Standards and Science (Korea, Republic of)
Won Hyun Park, College of Optical Sciences, The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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